[igraph] edge attribute access by name

[Sam Steingold]

How do I get the vector of edge attributes by name?
E.g.,
> gr
IGRAPH DN-- 404 2637 -- 
+ attr: name (v/c), domain (e/c), url (e/c)
> E(gr)$domain
  [1] "www.foo.com" "www.foo.com" "www.foo.com" "www.foo.com"
...
> E(gr)[["domain"]]
Error in E(gr)[["domain"]] : subscript out of bounds

how do I get the vector of attributes given string "domain"?

thanks!

-- 
Sam Steingold (http://sds.podval.org/) on Ubuntu 12.10 (quantal) X 11.0.11300000
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